body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #00f7ffaf; /* 设置一个备用背景颜色 */
  font-family: 华文中宋, serif;
  flex-direction: column;
}



ul, li {
  padding: 0;
  margin: 0;
  list-style: none;
}

a {
  text-decoration: none;
  outline: none; 
  color: #b1dfe7; 
  font-weight: 600;
}

.video-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  filter: blur(5px);
}

.video-background video {
  min-width: 100%;
  min-height: 100%;
  width: 2000px;
  height: auto;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.video-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5); /* 半透明的黑色遮罩 */
  z-index: 0;
}

  .content-video {
    width: 500px;
    height: 450px;
    position: relative;
    overflow: hidden;
    border-radius: 10px 10px 0 0;
    position: absolute;

  }

  .content-video video {
    width: 1000px;
    top: 0;
    left: -80px;
    position: absolute;
  }

.content-nr {
  width: 500px;
  height: 600px;
  background-color: #666699;
  display: flex;
  flex-direction: column;
  font-size: 40px;
  border-radius: 10px;
  position: relative;
}


canvas {
  width: 600px;
  height: 100px; /* 设置波形高度 */
  position: absolute;
  top: 0;
  left: 0;

}

.canvas-div {
  width: 500px;
  height: 100px;
  position: relative;
  overflow: hidden;
  margin-top: 20px;
}

.custom-play-btn {
  width: 200px;
  height: 50px;
  margin: 0 auto;
  margin-top: 538px;
  margin-right: 50px;
  border-radius: 20px;
  border: 0;
  font-size: 20px;
  color: #00f7ffaf;
  background-color: #474778b9;
}

.content-nr span {
  color: #ffffff;
  position: absolute;
  top: 480px;
  left: 180px;
  font-size: 30px;
}

.content-nr img {
  width: 130px;
  position: absolute;
  top: 460px;
  left: 40px;
}